Capsule for beverage preparation

Claim 1

A capsule containing a substance for making up a drink using an apparatus of the type which includes a water-injection piercing member which injects water into the capsule under pressure, said capsule being composed essentially of a sealed impervious body containing said substance and having the general shape of an upright acute truncated cone, the top of the body terminating into a generally domed end, said domed end having a recess for receiving said water-injection piercing member, the height of said body being approximately the same as the base dimension thereof, said body being provided at said base with an outer rim, a membrane defining a base closure member, and a filter interposed between said membrane, and said substance said membrane being resilient and bulging outwarding under the pressure of water injected into said capsule through said piercing member, said membrane being provided with an integral portion at least partially surrounded by a grooved line of weakness which brakes away from said membrane under the influence of the water pressure when said membrane is in bulged condition thereby forming an aperture in the membrane through which the drink will flow from the capsule.